/*
 * Copyright 2020 The Backstage Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Transformer, transform } from './transformer';

describe('transform', () => {
  it('calls the transformers', async () => {
    const fn = jest.fn();
    const mockTransformer = (): Transformer => (dom: Element) => {
      fn(dom);
      return dom;
    };

    await transform('<html></html>', [mockTransformer()]);

    expect(fn).toHaveBeenCalledTimes(1);
    expect(fn).toHaveBeenCalledWith(expect.any(Element));
  });
});
